Luther's Confrontation with Charles V at the Diet of Worms

Luther's confrontation with Charles V at the Diet of Worms demonstrated:

A) the Holy Roman Emperor's commitment to Lutheran reforms.
B) Luther's ability to compromise for the sake of his reforms.
C) the Holy Roman Emperor's attempt to preserve one of the major unifying institutions of his far-flung empire-the Church.
D) the fragmentation of the Holy Roman Empire and the power of the princes within it.
E) all of these